US4108551A - Observation and aiming apparatus, particularly on a vehicle - Google Patents

Observation and aiming apparatus, particularly on a vehicle Download PDF

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Publication number
US4108551A
US4108551A US05/750,653 US75065376A US4108551A US 4108551 A US4108551 A US 4108551A US 75065376 A US75065376 A US 75065376A US 4108551 A US4108551 A US 4108551A
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US
United States
Prior art keywords
sighting
axis
laser
periscope according
mirror
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US05/750,653
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English (en)
Inventor
Claude Edmond Georges Weber
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PARGECOM
Sagem SA
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Societe dEtudes et de Realisations Electroniques
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Assigned to PARGECOM reassignment PARGECOM MERGER (SEE DOCUMENT FOR DETAILS). Assignors: SOCIETE D'ETUDES ET DE REALISATIONS ELECTRONIQUES
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41G—WEAPON SIGHTS; AIMING
    • F41G3/00—Aiming or laying means
    • F41G3/06—Aiming or laying means with rangefinder
    • F41G3/065—Structural association of sighting-devices with laser telemeters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H5/00—Armour; Armour plates
    • F41H5/26—Peepholes; Windows; Loopholes
    • F41H5/266—Periscopes for fighting or armoured vehicles
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/02—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors
    • G02B23/08—Periscopes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/12—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices with means for image conversion or intensification
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
    • G02B27/642—Optical derotators, i.e. systems for compensating for image rotation, e.g. using rotating prisms, mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
    • G02B27/644—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for large deviations, e.g. maintaining a fixed line of sight while a vehicle on which the system is mounted changes course

Definitions

  • the invention relates to aiming or sighting apparatuses, particularly to a periscope for mounting on vehicles.
  • vehicles such as tanks
  • various problems occur as a function of circumstances and situations which can be solved specifically by one or more of diurnal observation, nocturnal observation, and sighting and measurements of target range.
  • the object of the present invention is to make it possible to satisfy such requirements.
  • the present invention relates to an apparatus having a modular construction which by combining components ensures diurnal vision, nocturnal vision and distance measurements of a target either separately or in twos or threes simultaneously.
  • the apparatus of this type is more particularly intended for use on tanks enabling their crews to carry out by day observations over a wide range or over a smaller but greatly magnified range, a distance measurement by means of a target no matter what firing corrections are introduced, and then at night a possible passive observation of the ground which assists movement and also aids the close defence of the vehicle.
  • the apparatus comprises a stabilised panoramic gunsight head positioned externally of the vehicle and a corresponding sight tube with at least one eyepiece positioned within the said vehicle, whereby said sight tube and said gunsight head are interconnected by a wall-traversing periscopic ferrule which can be substituted by a sleeve in which is placed either a nocturnal vision means or a range finding means or both of the said means.
  • the gunsight head is equipped with an occultable galilean optical member making it possible to vary the field of observation.
  • the sight tube is equipped with a Pechan prism whereof the orientation like that of the gunsight head equipped with a stabilised mirror is servo-controlled from the said mirror rotating about a bearing axis.
  • This sleeve can be fitted in place of the above-mentioned ferrule and contains the nocturnal vision means equipped with a light-amplifying element which can be occulted outside the optical path passing through the space between the sight tube and the gunsight head and which can be extended when placed on the said path.
  • This sleeve can also contain an element which is complementary to the ranging means which can be placed on the said path.
  • this sleeve has both the light-amplifying means and the ranging means, the above-mentioned complementary element can be alternately occulted with the light-amplifying means to leave space for the latter.
  • the ranging means comprises a generator for light-amplification by stimulated emission of radiation, normally called a laser, and the complementary ranging element is a dichroic sheet.
  • This laser generator is associated with a receiver which receives the corresponding light reflected on the target and returns it to the sight tube, and with a reticule projector whose projection axis intersects on the said sheet the axis of the laser light beam returning from the target, and then encounters a trihedron on the other side of the said sheet relative to the projector which reflects the image of the reticule viewed through the said sheet, whereby the latter returning it into the sighting axis. All this serves to obviate problems of axis alignment during the returning into position in the said sighting path of the said occultable dichroic sheet.
  • the light-amplifying member is carried by a tubular telescopic member which can be extended and retracted when its axis is located in the sighting path and has means for locking it in the extended position.
  • driving means are located in this sleeve to bring about the alternate putting into service of the light-amplifying means and the ranging means.
  • driving means are provided for extending or retracting the telescopic tube carrying the light amplifier.
  • These driving means preferably comprise a tape which can be unwound from a drum and having a thrust action on extension due to the fact that it has a high resistance to buckling but behaves in the manner of a band on rewinding during retraction.
  • a reversing device In the servo-mechanism of the Pechan prism a reversing device is provided whose action makes it possible to erect the image during nocturnal observation when the light-amplifier supplies an inverted intensified image relative to that which can be observed in diurnal vision.
  • the present apparatus can be readily adapted to all requirements with a minimum of components, a limited number of adjustments being necessary during each of the various fittings or changes.
  • FIG. 1 a schematic perspective view of a complete apparatus.
  • FIG. 2 a diagram of the optical range finding paths in the sight tube.
  • FIG. 3 a variant of FIG. 2.
  • FIG. 4 a schematic perspective view of the light-amplifier system which can be inserted alternately with the dichroic sheet system.
  • FIG. 5 a schematic perspective view of the servo-mechanism of the Pechan prism.
  • the periscopic apparatus shown in the drawings comprises a stabilised gunsight head 1 associated with an aiming and observation sight tube 3 connected to the head 1 either by a ferrule 2 or by a sleeve 4, whereby the interchangeable ferrule and sleeve traverse a supporting wall 11 belonging to a combat vehicle structure.
  • the gunsight head 1 projects upwards in the manner of a periscope and the sight tube 3 located inside is accessible to a hidden observer.
  • the gunsight head 1 contains a mirror 5 which is able to pivot about a sight axis 7 and which can assume any useful orientation and can then pivot about a bearing axis 8 without limitation.
  • This mirror is controlled by a stabilisation gyroscope contained in a box 6 located in head 1.
  • This assembly is contained in head 1 within a casing 9 thereof, said casing being provided in front of mirror 5 with a transparent window 10 which can be closed.
  • Casing 9 is mounted so as to rotate about bearing axis 8 and pivots by servo-control under manual drift action and automatic stabilisation action about the said axis.
  • the result of the servo-control action can be to pivot the casing 9 by an angle equal to that by which the observer has rotated mirror 5 for bearing purposes, for example by causing a precession of the corresponding gyroscope about an appropriate axis.
  • Casing 9 and all that is contained therein is pivoted relative to sight tube 3 and ferrule 2 or sleeve 4 integral with the structure 11 of the vehicle, by any desired servo-mechanism which is not shown and which will not be described in detail here.
  • sight tube 3 contains a Pechan prism 12 located between the said prism 3a and the said fixed eyepiece of eyepieces of sight tube 3.
  • the function of such a Pechan prism is to maintain the horizontality of the countryside observed no matter what the sighting direction compared with the axis of travel of the vehicle in the fixed eyepieces.
  • the servo-control means which actuate the Pechan prism will be described with regard to FIG. 5.
  • Head 1 contains a movable galilean member 13 which can be occulted outside the path formed by the optical sighting path of axis 20 which coincides with the bearing axis 8.
  • this galilean member 13 When this galilean member 13 is placed on this axis between mirror 5 and prism 3a, it divides the magnification of the sight tube by it own magnification thus increasing the field of vision in the same ratio. However, when it is removed therefrom the field of observation is reduced but the nominal magnification of the sight tube is restored.
  • the optical apparatus may comprise solely the gunsight head 1, sight tube 3 and ferrule 2 which joins the same and supports them on structure 11 in the case that the function to be fulfilled is limited solely to daytime observation with a variation of the field for successive surveillance observations and more detailed observations of the points of interest.
  • the ferrule 2 can be substituted by a sleeve 4, whereby a nocturnal vision means 14 is contained in the same sleeve and which via a connection interface 15 can receive an external range finding unit 16.
  • This interface is a flanged base to which can be connected a linked flange 16a causing a lateral opening in sleeve 4 and an identical outlet opening in unit 16 to face one another.
  • Unit 16 comprises a box containing a laser emitter 17, a laser receiver 18 and associated optical elements 19 which will be described in greater detail hereinafter.
  • the lateral opening of base 15 faces an occultable dichroic sheet 24 and a fixed trihedron which will be described in detail hereinafter.
  • flange 16a and base 15 make it possible to install or remove the ranging unit 16 without involving any difficult problem of coincidence between the sighting axis defined by the projection of a reticule in the eyepieces of sight tube 3 and the laser light reception and emission axes, as will be shown hereinafter.
  • sleeve 4 and its ancillary means are arranged in such a way that it is simple to combine and select ranging functions, diurnal vision and nocturnal vision.
  • the feature of the dichroic sheet 24 is that it is transparent, therefore permitting the passage of visible light beams in the direction of the eyepiece of eyepieces of sight tube 3, but reflects the laser light beams, i.e. not only directs the beam 21a from emitter 17 (FIG. 2) in the direction of mirror 5 which then directs the said beam onto a target parallel to the sighting axis, but also reflects towards receiver 18 the laser light beam returning from the target after reflection on mirror 5.
  • emitter 17 and receiver 18 offer parallel optical axes 25 and 37.
  • rhombohedron 26 reduces the centre to centre distance between the emission beam and the reception beam whose initial spacing results from the necessary physical dimensions of the emitter 17 and the receiver 18.
  • a divergent lens 27 is followed by a total reflection prism 29 and then by a convergent lens 28, thus forming an objective which makes afocal the laser emission path of axis 21a falling on the dichroic sheet 24.
  • the optical return path of axis 22b parallel to bearing axis 8 has on the corresponding optical axis 22a after reflection on sheet 24 a first convergent lens 30, then after a semi-transparent mirror 33 and behind a subsequent diaphragm 32 a second convergent lens 31 on axis 37 which thus makes the reception path afocal.
  • Diaphragm 32 placed in the object focal plane of this reception objective defines the reception field and prevents multiple echoes in the reception of ranging signals.
  • a source 34 located behind a condenser 35 lights up a reticule 36 placed on the focal plane of condenser 35 which coincides which that of the convergent lens 30 viewed through the semi-transparent mirror 33.
  • the illumination of reticule 36 forms a beam traversing sheet 24 with deflection parallel to itself returned by a trihedron 38 and then reflected by the rear face of said sheet 24 exactly onto axis 8 as shown in FIG. 2.
  • Such an optical diagram is suitable for an arrangement of emitter 17 and receiver 18 with their optical axes 25 and 37 located in the incident plane of dichroic sheet 24 and parallel to axis 20.
  • FIG. 3 where prism 29 is eliminated but where the rhombohedron 26a for bringing together axes 25a and 37a, divergent lens 27a and convergent lens 28a coaxial for the emission objective, convergent lenses 30a and 31a coaxial for the reception objective, a diaphragm 32a on axis 37a as well as a semi-transparent mirror 33a, reticule system 36a, condenser 35a and the source 34a having its optical axis perpendicular to axis 37a facing mirror 33a are retained.
  • the function of mirror 33a is the opposite to that of mirror 33; thus, it permits the passage of coherent light to the laser receiver but reflects the projection of the reticule.
  • FIG. 4 partly shows intermediate sleeve 4 and its content beneath the lower portion of the gunsight head 1 in which are solely shown mirror 5 and galilean member 13 constituted by two lenses 39 and 40 fixed in mountings perpendicular to a pivot pin 41 parallel to sighting axis 20.
  • These mountings are integral with the ends of pin 41 which rotates in a bearing 41a connected to the inner frame of head 1 and which can therefore move in the manner shown from position 13 into position 13a perpendicular to the said axis.
  • Pivot pin 41 is integral with a toothed segment 41b with which meshes a pinion 42a carried by the shaft of a control motor 42 which serves to insert or remove from the optical path lenses 39 and 40.
  • Insertion corresponds to diurnal observation with an extensive field and removal to diurnal observation with a reduced field but with greater magnification. This situation of occulting the Galilean system is maintained in the case of nocturnal observation both for sighting or aiming and for ranging on a target.
  • the above-mentioned device 14 is used which is mounted on a pin 47 parallel to sighting axis 20 by two arms 46a, 46b which support body 45a of said means 14.
  • One of the arms 46b carries a toothed segment 48b with which cooperates a pinion 48a carried by the shaft of a motor 48.
  • one of the arms 46a, 46b supports a geared motor 49 whose output shaft carries a drum 50 onto which can be wound a special band 51. On winding and unwinding this band is flexible with regard to the drum but it is rigid when it is free and rectilinear.
  • body 45a there is slidingly mounted an intermediate bush 45b wherein slides a tube 45c which is attached to band 51. It contains a micro-channel light amplifier 45 of per se known construction and able to detect low level light signals and to restore them in amplified manner on a rear screen 45.
  • the end of tube 45c carries an objective 53 and cooperates with articulated locking clamps 57 facing an armature 58 associated with a magnetic coil 56 and which is able to swing clamps 57 towards tube 45c when the telescopic device is extended.
  • a convergent optical system 55 which makes the nocturnal vision path afocal and optionally divides the magnification of the sight tube by its natural magnification in order to obtain that which is adapted to nocturnal vision.
  • dichroic sheet 24 is occultable and is supported by an arm 43a integral with a pivot 43 to which is fixed a toothed segment 43b which meshes a pinion 44a mounted on the shaft of a motor 44.
  • the Pechan prism 12 of sight tube 3 is mounted in a toothed rim 59 which is able to rotate in all appropriate not shown guides under the action of a pinion 60 integral with the output shaft of a motor 61.
  • a second pinion 62 carried by the shaft of a detector 63 meshes with pinion 60.
  • the detector is connected by a line 64 to an amplifier 65 which controls motor 61 with the interpositioning of a changeover relay 66 placed between the outputs of detector 63 and the inputs of amplifier 65.
  • Another detector 67 is located in gunsight head 1 with connection by toothed wheels (only one wheel 68 is shown) with the rotary casing 9 or any other member integral therewith or which will be directly or indirectly connected therewith in head 1, whereby the ratio of the gear train is equal to unity.
  • Detector 67 is electrically connected to detector 63.
  • the gear ratio between pinions 60 and 62 is equal to unity whilst that provided between pinion 60 and rim 59 is equal to 1/2.
  • prism 12 is servo-controlled in the ratio 1/2 to the rotation in bearing of mirror 5 and in corresponding manner erects the image viewed in the eyepiece or eyepieces.
  • assembly 14 is obviously contracted and occulted outside the path of the light rays of the observation path whose axis coincides with axis 20 and axis 8.
  • Changeover relay 66 can remain in the above position if image intensifier 45 does not introduce an optical inversion compared with diurnal vision. If inversion occurs the electrical changeover relay 66 is operated and changes position which leads to a rotation of the Pechan prism 12 by a quarter of a turn.
  • this equipment can be used for simple diurnal observation functions with double magnification if head 1 is connected to sight tube 3 by a ferrule 2, whereby it is possible to add to these functions that of nocturnal observation by substituting for ferrule 2 a sleeve 4 which is internally provided with an occultable device 14.
  • a system can be provided with an aiding or sighting and ranging function by combining with sheeve 4 a laser emitter and receiver system 16 with a reticule projector, whereby this system may or may not be linked with the existence in sleeve 4 of the nocturnal observation system 14. If this system is present, sheet 24 is mounted on a movable support 43a which permits occulting.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Astronomy & Astrophysics (AREA)
  • Telescopes (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
US05/750,653 1975-12-29 1976-12-15 Observation and aiming apparatus, particularly on a vehicle Expired - Lifetime US4108551A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7539960 1975-12-29
FR7539960A FR2337326A1 (fr) 1975-12-29 1975-12-29 Appareil d'observation et de visee, notamment sur vehicule

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US4108551A true US4108551A (en) 1978-08-22

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US05/750,653 Expired - Lifetime US4108551A (en) 1975-12-29 1976-12-15 Observation and aiming apparatus, particularly on a vehicle

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US (1) US4108551A (enrdf_load_stackoverflow)
BE (1) BE849307A (enrdf_load_stackoverflow)
CA (1) CA1075507A (enrdf_load_stackoverflow)
CH (1) CH613784A5 (enrdf_load_stackoverflow)
DE (1) DE2656673C3 (enrdf_load_stackoverflow)
FR (1) FR2337326A1 (enrdf_load_stackoverflow)
GB (1) GB1529260A (enrdf_load_stackoverflow)
IT (1) IT1065746B (enrdf_load_stackoverflow)
SE (1) SE433134B (enrdf_load_stackoverflow)

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US4475793A (en) * 1982-06-01 1984-10-09 Texas Instruments Incorporated Integrated optical beam expander
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US6490027B1 (en) * 1999-07-27 2002-12-03 Suzanne K. Rajchel Reduced noise optical system and method for measuring distance
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US6583862B1 (en) * 1999-06-10 2003-06-24 Andreas Perger Combined telescope and telemeter device
US20040212863A1 (en) * 2001-07-19 2004-10-28 Holger Schanz Method and apparatus for optically scanning a scene
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US6886287B1 (en) 2002-05-18 2005-05-03 John Curtis Bell Scope adjustment method and apparatus
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US9310165B2 (en) 2002-05-18 2016-04-12 John Curtis Bell Projectile sighting and launching control system
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FR2634289A1 (fr) * 1988-07-13 1990-01-19 Leitz Wild Gmbh Periscope panoramique
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US6583862B1 (en) * 1999-06-10 2003-06-24 Andreas Perger Combined telescope and telemeter device
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US7703719B1 (en) 2002-05-18 2010-04-27 John Curtis Bell Scope adjustment method and apparatus
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Also Published As

Publication number Publication date
DE2656673A1 (de) 1977-07-07
SE433134B (sv) 1984-05-07
BE849307A (fr) 1977-04-01
DE2656673B2 (de) 1978-06-29
FR2337326B1 (enrdf_load_stackoverflow) 1982-05-07
SE7614040L (sv) 1977-06-30
CH613784A5 (enrdf_load_stackoverflow) 1979-10-15
CA1075507A (fr) 1980-04-15
IT1065746B (it) 1985-03-04
DE2656673C3 (de) 1979-03-01
GB1529260A (en) 1978-10-18
FR2337326A1 (fr) 1977-07-29

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